CVE-2021-34470 json
Microsoft Exchange Server Elevation of Privilege Vulnerability
published 2021-07-14 5 y ago modified 2026-08-10 2 mo ago also EUVD-2021-21125
- cvss
- 8.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.4%
- EPSS 4.4% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
Microsoft Exchange Server Elevation of Privilege Vulnerability
Patch / fix
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 15.00.1497.023
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 21 15.01.2308.008
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 10 15.02.0922.007
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
4.38% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 8.0 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 5.2 | AV:A/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Microsoft Microsoft Exchange Server 2013 Cumulative Update 23
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 21
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 10
Classification
- Technology feeds
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-34470
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-34470
patch, vendor-advisory
-
packetstormsecurity.com
/files/163706/Microsoft-Exchange-AD-Schema-Misconfiguration-Privilege-Escalation.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-34470
- NVD CVE-2021-34470
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.